This is awesome! Totally can relate. I am both a crazy planner (not just about Disney, about pretty much everything, especially travel) and a spreadsheet nerd. My spreadsheet has many tabs, colors, even pivot tables. Planning trips is a big part of the fun for me, which is why this Disney trip has been a great project for me this year. It will be our first trip to WDW as a family. Its like there are 2 separate activities to enjoy - the trip planning and the trip itself. I just love imagining everyone's reactions to the "surprises" I've planned along the way.
Of course, trips never actually follow the plan. That is fine, and I fully expect to roll with the punches, depending on the circumstances and how we are feeling. I figure if I plan out the most we could possibly do, we can cut things out as needed and still have great time. All the research and considering different options makes it easier if we do need to adjust our plans. And as a previous poster said - a lot of the spreadsheet stuff is just for my own entertainment!